add mainnet .env (#6)

Co-authored-by: Nita Neou <soph@harmony.one>

.env

@@ -0,0 +1,9 @@
+REACT_APP_RPC_URL_SHARD0=http://internal.s0.t.hmny.io
+REACT_APP_RPC_URL_SHARD1=https://api.s1.t.hmny.io
+REACT_APP_RPC_URL_SHARD2=https://api.s2.t.hmny.io
+REACT_APP_RPC_URL_SHARD3=https://api.s3.t.hmny.io
+REACT_APP_AVAILABLE_SHARDS=0,1,2,3
+REACT_APP_EXPLORER_V1_API_URL=https://explorer.pops.one:8888
+REACT_APP_INDEXER_IPFS_GATEWAY=https://ipfs.io/ipfs/
+REACT_APP_PROD_ADDRESS=https://explorer-v2-api.hmny.io
+#REACT_APP_DEV_ADDRESS=https://ws.explorer-v2.hmny.io

.gitignore

@@ -32,5 +32,4 @@ yarn.lock
 .firebaserc
 firebase.json
 firebase-debug.log
-.firebase
-.env
+.firebase